diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/dbl-64/s_isnan.c')
| -rw-r--r-- | REORG.TODO/sysdeps/ieee754/dbl-64/s_isnan.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/dbl-64/s_isnan.c b/REORG.TODO/sysdeps/ieee754/dbl-64/s_isnan.c new file mode 100644 index 0000000000..2174d988d8 --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/dbl-64/s_isnan.c @@ -0,0 +1,44 @@ +/* @(#)s_isnan.c 5.1 93/09/24 */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: s_isnan.c,v 1.8 1995/05/10 20:47:36 jtc Exp $"; +#endif + +/* + * isnan(x) returns 1 is x is nan, else 0; + * no branching! + */ + +#include <math.h> +#include <math_private.h> +#include <shlib-compat.h> + +#undef __isnan +int +__isnan (double x) +{ + int32_t hx, lx; + EXTRACT_WORDS (hx, lx, x); + hx &= 0x7fffffff; + hx |= (u_int32_t) (lx | (-lx)) >> 31; + hx = 0x7ff00000 - hx; + return (int) (((u_int32_t) hx) >> 31); +} +hidden_def (__isnan) +weak_alias (__isnan, isnan) +#ifdef NO_LONG_DOUBLE +# if defined LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23) +compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0); +# endif +weak_alias (__isnan, isnanl) +#endif |